Rihanna bares booty in G-string monokini... just days after stripping topless

WATER GODDESS: Rihanna stripped down to a raunchy thong swimsuit for a photo shoot [SPLASH]

The 25-year-old sex kitten was spotted in the pool of a botanical garden continuing her flesh-flashing shoot for Brazilian Vogue.

While the tropical surroundings were indeed breathtaking, they were nothing compared to the sight of Riri in a bum-baring monokini.

The Barbadian singer flaunted her bootylicious derriere in a thong swimsuit, which left very little to the imagination as Rihanna arched her back.

The black swimsuit, which was completely backless, exposed plenty of cleavage and skin at the front with some daring cut-outs, and only preserved the star's modesty with two flimsy strings tied around her neck.